Two-Pion Exchange Contributions to the Nucleon-Nucleon Interaction from the Roper Resonance
Nuclear Theory
2026-03-02 v2
Abstract
We derive the long-range components of the nucleon-nucleon (NN) two-pion-exchange potential with an intermediate Roper resonance. Leading-order interactions in heavy-baryon chiral perturbation theory are considered. NN phase shifts with orbital angular momentum are calculated in first-order perturbation theory and compared to those obtained without the Roper resonance. We show that the Roper contribution is sizeable for waves and improves the description of phase shifts for all the partial waves slightly. We also discuss the role of the Roper resonance in the NN interaction in the framework of resonance saturation.
Keywords
Cite
@article{arxiv.2602.11815,
title = {Two-Pion Exchange Contributions to the Nucleon-Nucleon Interaction from the Roper Resonance},
author = {Yang Xiao and Li-Sheng Geng and U. van Kolck},
journal= {arXiv preprint arXiv:2602.11815},
year = {2026}
}
Comments
We correct a factor in the triangle-diagram contribution and update the corresponding expressions